physical education. n. (Education) training and practice in sports, gymnastics, etc, as in schools and colleges. Abbreviation: PE. physâ²ical educaâ²tion. n. instruction in sports, exercise, and hygiene, esp. as part of a school or college program.
3. Stress/injury. Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.
Unlikely: It's unlikely that biting the inside of the cheek would cause bruising that's visible from the outside. The mucosal lining of the mouth is actually very tough, and you'd have to bite through a very thick layer of mucosa to cause bleeding that'd be visible as a bruise from the outside. ...Read more. Dr. Melissa Gowans.